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Marketable Securities (Tables) | 6 Months Ended
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Dec. 31, 2018
Investments, Debt and Equity Securities [Abstract] |
Summary of Marketable Securities | The amortized cost and fair value of marketable securities as of the dates indicated below were as follows:
As of December 31, 2018 (In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate debt securities | $ | 505,296 |  |  | $ | — |  |  | $ | (4,702 | ) |  | $ | 500,594 |
Money market funds and other | 877,527 |  |  | — |  |  | — |  |  | 877,527 |
Sovereign securities | 11,008 |  |  | — |  |  | (89 | ) |  | 10,919 |
U.S. Government agency securities | 174,058 |  |  | 2 |  |  | (1,445 | ) |  | 172,615 |
U.S. Treasury securities | 881,704 |  |  | 36 |  |  | (2,094 | ) |  | 879,646 |
Subtotal | 2,449,593 |  |  | 38 |  |  | (8,330 | ) |  | 2,441,301 |
Add: Time deposits(1) | 48,265 |  |  | — |  |  | — |  |  | 48,265 |
Less: Cash equivalents | 1,589,418 |  |  | 36 |  |  | — |  |  | 1,589,454 |
Marketable securities | $ | 908,440 |  |  | $ | 2 |  |  | $ | (8,330 | ) |  | $ | 900,112 |
As of June 30, 2018 (In thousands) | Amortized Cost |  | Gross Unrealized Gains |  | Gross Unrealized Losses |  | Fair Value
Corporate debt securities | $ | 747,763 |  |  | $ | 148 |  |  | $ | (7,508 | ) |  | $ | 740,403 |
Money market funds and other | 863,115 |  |  | — |  |  | — |  |  | 863,115 |
Sovereign securities | 17,293 |  |  | — |  |  | (151 | ) |  | 17,142 |
U.S. Government agency securities | 326,508 |  |  | 16 |  |  | (2,827 | ) |  | 323,697 |
U.S. Treasury securities | 411,329 |  |  | 3 |  |  | (3,682 | ) |  | 407,650 |
Subtotal | 2,366,008 |  |  | 167 |  |  | (14,168 | ) |  | 2,352,007 |
Add: Time deposits(1) | 54,537 |  |  | — |  |  | — |  |  | 54,537 |
Less: Cash equivalents | 930,608 |  |  | — |  |  | — |  |  | 930,608 |
Marketable securities | $ | 1,489,937 |  |  | $ | 167 |  |  | $ | (14,168 | ) |  | $ | 1,475,936 |
________________ (1) Time deposits excluded from fair value measurements.
Investments with Gross Unrealized Losses | The following table summarizes the fair value and gross unrealized losses of our investments that were in an unrealized loss position as of the date indicated below:
As of December 31, 2018 (In thousands) | Fair Value |  | Gross Unrealized Losses(1)
Corporate debt securities | $ | 497,833 |  |  | $ | (4,702 | )
U.S. Treasury securities | 211,588 |  |  | (2,094 | )
U.S. Government agency securities | 169,967 |  |  | (1,445 | )
Sovereign securities | 10,919 |  |  | (89 | )
Total | $ | 890,307 |  |  | $ | (8,330 | )
__________________ (1) As of December 31, 2018, the amount of total gross unrealized losses related to investments that had been in a continuous loss position for 12 months or more was $7.9 million.
Contractual Maturities of Securities | The contractual maturities of securities classified as available-for-sale, regardless of their classification on our Condensed Consolidated Balance Sheet, as of the date indicated below were as follows:
As of December 31, 2018 (In thousands) | Amortized Cost |  | Fair Value
Due within one year | $ | 567,385 |  |  | $ | 563,316 |
Due after one year through three years | 341,055 |  |  | 336,796 |
| $ | 908,440 |  |  | $ | 900,112 |

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- Definition Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments. + References No definition available. + Details
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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563 + Details
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